26686445537 has 2 divisors, whose sum is σ = 26686445538. Its totient is φ = 26686445536.

The previous prime is 26686445509. The next prime is 26686445557. The reversal of 26686445537 is 73554468662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19164526096 + 7521919441 = 138436^2 + 86729^2 .

It is a cyclic number.

It is not a de Polignac number, because 26686445537 - 2⁸ = 26686445281 is a prime.

It is not a weakly prime, because it can be changed into another prime (26686445507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13343222768 + 13343222769.

It is an arithmetic number, because the mean of its divisors is an integer number (13343222769).

Almost surely, 2^26686445537 is an apocalyptic number.

It is an amenable number.

26686445537 is a deficient number, since it is larger than the sum of its proper divisors (1).

26686445537 is an equidigital number, since it uses as much as digits as its factorization.

26686445537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29030400, while the sum is 56.

The spelling of 26686445537 in words is "twenty-six billion, six hundred eighty-six million, four hundred forty-five thousand, five hundred thirty-seven".